Practice has shown that pig breeding has many advantages over captivity. First, the area is less than the circle pigs: pigs usually need an area of ​​about 5 square meters. A pig cage 140 centimeters long, 5 centimeters wide and 100 centimeters high occupies an area of ​​only 0.7 square meters, which is less than one-seventh of a pig's lap. If a double-layered, multi-layered cage pig is used, it will occupy a smaller area. . Second, the low cost: build a better pigsty, need to invest 800-1000 yuan, and build a pig cage, only about 100 yuan, if used properly, available for more than 10 years. Third, easy to move: After the pig ring is made, it is fixed, and the weight of the pig cage is only 40-50 kilograms. The volume is small and easy to move. The position can be changed according to weather changes and other needs of the four seasons. 4. Clean and hygienic: Since the pig cages use floor drains, the excrement can flow into the dung tanks under the cage or the excrement boards, making the cages much cleaner than the pens, which can reduce the occurrence and spread of diseases. Fifth, the management is convenient: As a result of the implementation of a cage and a pig, the pigs will not compete for food and bite each other, which is beneficial for the pigs to eat and rest. Sixth, to promote growth: Cage pigs than the circulatory culture of lean meat increased by 0.8%, an increase of 21.5 grams of daily gain, 58 grams per kilogram of weight gain feed.